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The Effect of Chemical Reactivity on the Formation of Gaseous Oblique Detonation Waves

1
Department of Mechanical, Industrial and Aerospace Engineering, Concordia University, Montreal, QC H3G 1M8, Canada
2
School of Aerospace Engineering, Beijing Institute of Technology, Beijing 100081, China
3
Department of Physics, Cavendish Laboratory, University of Cambridge, Cambridge CB3 0HE, UK
*
Author to whom correspondence should be addressed.
Aerospace 2019, 6(6), 62; https://doi.org/10.3390/aerospace6060062
Received: 24 April 2019 / Revised: 21 May 2019 / Accepted: 24 May 2019 / Published: 28 May 2019
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Abstract

High-fidelity numerical simulations using a Graphics Processing Unit (GPU)-based solver are performed to investigate oblique detonations induced by a two-dimensional, semi-infinite wedge using an idealized model with the reactive Euler equations coupled with one-step Arrhenius or two-step induction-reaction kinetics. The novelty of this work lies in the analysis of chemical reaction sensitivity (characterized by the activation energy Ea and heat release rate constant kR) on the two types of oblique detonation formation, namely, the abrupt onset with a multi-wave point and a smooth transition with a curved shock. Scenarios with various inflow Mach number regimes M0 and wedge angles θ are considered. The conditions for these two formation types are described quantitatively by the obtained boundary curves in M0Ea and M0kR spaces. At a low M0, the critical Ea,cr and kR,cr for the transition are essentially independent of the wedge angle. At a high flow Mach number regime with M0 above approximately 9.0, the boundary curves for the three wedge angles deviate substantially from each other. The overdrive effect induced by the wedge becomes the dominant factor on the transition type. In the limit of large Ea, the flow in the vicinity of the initiation region exhibits more complex features. The effects of the features on the unstable oblique detonation surface are discussed. View Full-Text
Keywords: propulsion; oblique detonation; CFD; supersonic combustion; chemical kinetics propulsion; oblique detonation; CFD; supersonic combustion; chemical kinetics
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Yan, C.; Teng, H.H.; Mi, X.C.; Ng, H.D. The Effect of Chemical Reactivity on the Formation of Gaseous Oblique Detonation Waves. Aerospace 2019, 6, 62.

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